Consolidated Statements of Changes in Partners’ Capital - USD ($) $ in Thousands	Class A preferred units	Common units	Total
Partner's Deficit at Dec. 31, 2015	$ 17,112	$ (45,285)	$ (28,173)
Partner's Deficit (in shares) at Dec. 31, 2015	11,694,364	3,240,813
Units tendered by employees for tax withholding		$ (140)	(140)
Units tendered by employees for tax withholding (in shares)		(12,227)
Units forfeited by employees (in shares)		(2,000)
Unit-based compensation programs		$ 2,044	2,044
Unit-based compensation programs (in shares)		67,627
Issuance of common units, net of offering costs		$ 96,278	96,278
Issuance of common units, net of offering costs (in shares)		9,226,595
Class A Preferred Units converted to common units	$ (17,112)	$ 17,112
Class A Preferred Units converted to common units (in shares)	(11,694,364)	1,169,441
Common units retired via unit repurchase program		$ (2,948)	(2,948)
Common units retired via unit repurchase program (in shares)		(242,500)
Cash distributions to common unit holders		$ (6,696)	(6,696)
Distributions - Class B preferred units		(62,852)	(62,852)
Net income		19,231	19,231
Partner's Deficit at Dec. 31, 2016		$ 16,744	16,744
Partner's Deficit (in shares) at Dec. 31, 2016		13,447,749
Unit-based compensation programs		$ 3,373	3,373
Unit-based compensation programs (in shares)		217,481
Issuance of common units, net of offering costs		$ 11,228	11,228
Issuance of common units, net of offering costs (in shares)		906,613
Cash distributions to common unit holders		$ (25,192)	(25,192)
Common units issued as Class B Preferred distributions		$ 5,250	5,250
Common units issued as Class B Preferred distributions (in shares)		393,291
Distributions - Class B preferred units		$ (37,671)	(37,671)
Net income		(3,040)	(3,040)
Partner's Deficit at Dec. 31, 2017		$ (29,308)	$ (29,308)
Partner's Deficit (in shares) at Dec. 31, 2017		14,965,134